Now the Unmatched Entries is a long long list and I was woundering what it means and what I can do to not show it. I have tried playing around with the detail level of logwatch but it shows even on detail=1

I think logwatch will report every unmatched entry regardless of the detail level.
Perhaps you should have a look in the filter sets in /usr/share/logwatch/scripts/services/ or perhaps a newer version of logwatch already covers your unmatched entries.